Adding angular.Directive to externs.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=51415963
Also rotate commutative operators to eliminate parens.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=51438644
Merge remote-tracking branch: upstream/master